Sorry, no online dictionaries contain the exact phrase fail operational.
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Reverse dictionary results:
1. alert
 2. aut
3. enable
4. enabled
5. enabling
6. iff
7. inactive
8. off
9. operationalize
10. out
 11. pff
12. raring
13. run
14. runs
15. sortie
16. staff
17. worked
18. working
19. works
20. abate
 21. abating
22. abort
23. beat
24. beats
25. blank
26. blow
27. bollocks
28. bounce
29. break
30. bungle
 31. bunk
32. bust
33. catch
34. cease
35. ceasing
36. choke
37. choked
38. cold
39. collapse
40. come

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You can look up the words in the phrase individually using these links:   fail ?   operational ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
fail*to search for words beginning with fail, or
*onalto search for words ending with onal
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